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A laptop computer that weighs less than four pounds. In order to reduce weight, subnotebooks, also called "Ultrabooks" or "ultralights," often eliminate built-in CD/DVD drives. However, if optical discs are required when traveling, an external drive in the travel bag generally adds more weight than a built-in drive.

The Mini Laptop/Netbook
In the 2007 time frame, subnotebooks called "mini laptops" and "netbooks" made their debut, the latter term coined by Intel for machines that use its Atom processor. Weighing up to three pounds, mini laptops/netbooks have screens from 8 to 10" (see netbook). For features of portable computers, see laptop. See ultrathin laptop, notebook and Ultrabook.

The Trend Setter
In 1998, Sony popularized the subnotebook class with its VAIO (pronounced "vy-o") 505G at three pounds and less than an inch thick. To reduce traveling weight, floppy and CD-ROM drives were external, and a docking station was included. (Image courtesy of Sony Corporation.)

Laptop and Netbook
The Acer netbook on the right sports an 8.9" screen compared to 15" on its big brother to the left. Netbooks sacrifice keyboard and screen size for portability.
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References in periodicals archive ?
British Embassy officials then downloaded data from the "rock" on to palm-top computers.
THE LAST people most farmers would like controlling European agricultural policy are glib public relations experts, armed with palm-top digital personal organisers and a sheaf of focus group studies.
Key bookmakers required for sample who do not participate through equipment developed by Betlink (for SIS) and Winning Odds (for PA) will be covered by SIS staff using palm-top computers linked to `racing box'.
John Dixon, managing director, said: "It means that I can collect and send messages to and from all those usually separate media from my desktop, laptop or palm-top - and I can do that at the office, at home, in a cyber caf or in my car.
There are four VDC sizes, from the credit card-sized VDC-400, which allows a soldier to work with palm-top computers, to a special model for airborne use or IP-based networking.
Cigarettes, lighter, lipstick, phone, palm-top computer and a commemorative shell casing from Bosnia.
As described in your article, simpler and more effective palm-top computer systems are being used in conjunction with laser rangefinders to precisely locate a target's grid and altitude, then send the fire mission to the FSC, or the supporting battery's Fire Direction Center.
Known risk factors are checked via taps on the touch-sensitive palm-top device's screen.
Nowadays there is a wilderness of electronic gadgets offering wireless phone service, palm-top computing, pocket email receivers, appointment calendars.
With consumers searching for such devices as palm-top computers and new game consoles, such consumer electronics retailers as Kingfisher PLC and Dixons Group PLC are expected to emerge as popular choices by consumers.
The pH meter is sold both separately and with a Handspring Visor palm-top unit, and ranges from a mere $595 without the palm system, up to $995 with a palm and all additional options.
As the rapid development of palm-top computing and digital cellular telephony continues, and the resulting demand for lightweight information appliances increases, the Java VM (Virtual Machine) market will rise at a compound annual growth rate (CAGR) of 83.5 percent from 2000 to 2005, according to Cahners In-Stat/MDR.